Greetings from the GOM. Food for thought, though I’ve not read nor heard anyone linking the two Puma characteristics:
1) Makila engines compressor stall regularly. (Normal for all gas turbines, according to Eurocopter/Airbus). After personally experiencing it in the 225 I can testify it is moderately violent and affects the entire drive train and airframe.
2) Components within the gearbox have a history of failing.
Any thoughts on the shock of multiple compressor stalls on MGB components?